Again for backlinks

Hi to All,
I just found a site with comments. It has a good PR. The only problem is that I can not post my backlinks there. I tried every syntax I know but it stays as text only. It seems that links are disabled but there are other fresh comments with backlinks included. Any suggestions?

try to put your kw in the name field then put your url. it will act as an anchor text
Posted via Mobile Device

I know this but it doesn't work here. You must be logged to post a comment and there is no url, only subject and message.